/*
 * Licensed to Crate.io GmbH ("Crate") under one or more contributor
 * license agreements.  See the NOTICE file distributed with this work for
 * additional information regarding copyright ownership.  Crate licenses
 * this file to you under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.  You may
 * obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations
 * under the License.
 *
 * However, if you have executed another commercial license agreement
 * with Crate these terms will supersede the license and you may use the
 * software solely pursuant to the terms of the relevant commercial agreement.
 */

package io.crate.execution.support;

import java.io.IOException;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.elasticsearch.transport.TransportChannel;
import org.elasticsearch.transport.TransportRequest;
import org.elasticsearch.transport.TransportRequestHandler;
import org.elasticsearch.transport.TransportResponse;

import io.crate.common.exceptions.Exceptions;

public final class NodeActionRequestHandler<TRequest extends TransportRequest, TResponse extends TransportResponse>
    implements TransportRequestHandler<TRequest> {

    private final NodeAction<TRequest, TResponse> nodeAction;
    private static final Logger LOGGER = LogManager.getLogger(NodeActionRequestHandler.class);

    public NodeActionRequestHandler(NodeAction<TRequest, TResponse> nodeAction) {
        this.nodeAction = nodeAction;
    }

    @Override
    public void messageReceived(TRequest request, TransportChannel channel) throws Exception {
        try {
            nodeAction.nodeOperation(request).whenComplete((result, throwable) -> {
                if (throwable == null) {
                    try {
                        channel.sendResponse(result);
                    } catch (IOException e) {
                        LOGGER.error("Error sending response: " + e.getMessage(), e);
                    }
                } else {
                    try {
                        channel.sendResponse(Exceptions.toException(throwable));
                    } catch (IOException e) {
                        LOGGER.error("Error sending failure: " + e.getMessage(), e);
                    }
                }
            });
        } catch (Throwable t) {
            try {
                channel.sendResponse(Exceptions.toException(t));
            } catch (IOException e) {
                LOGGER.error("Error sending failure: " + e.getMessage(), e);
            }
        }
    }
}
